Up-and-over. The up-and-over garage door does not require more than the site width for opening. The door hinges, tilts and slides up into the garage roof space for half its depth. Through lack of care, older swing doors often warp, fail to hang or close properly. As a result, hinges rust and break. The simple slide-away action needs less maintenance and has brought the up-and-over door to its present popularity.
Basically, an up-and-over door consists of a single panel of lightweight steel, aluminium or wood, pivoted on a pendulum system.
Fixing is relatively easy and there is a wide range of sizes to meet the requirements of most garage openings. For a non-standard opening, thicker door jambs can be used to make an adjustment.
A number of manufacturers produce door-opening gear so that you can use a door of your own choice or make your own door. Some makes of door incorporate windows to give extra light to the garage. Mechanism. The main types of mechanism are the spring balance and the weight counterbalance. The former operates on the principle of a pair of balanced springs, some with rollers which ensure an even, controlled opening. The weight counterbalance consists of a pair of weights on each side of the door, controlling the movement of the track mechanism.
Another method uses a non-track system which eliminates both springs and weights. This has a spring-loaded drum, prebalanced in the factory. Fixing of the door is independent of both timber jambs and lintel or headframe.
A fourth type consists of wood, steel or aluminium shutters, which roll away on a spring roller and can be either hand or electrically operated.
“Extras”. Sophisticated and expensive refinements, usually costing more than the actual door, are photo-electric cells, operated by car headlights, and transistorized, radio-controlled devices which open the door, so that you do not have to leave the car, a boon in bad weather. Less ex-expensive are push-button mechanisms which swing the door open electrically. Swing doors. Garage doors generally fix to a wooden frame. An average door may be hung on jambs of about 4 in. by 2 in. (10 by 5cm) in size. These must be firmly fixed and, if necessary, set in a bed of 6 in. (or 15 cm) concrete. The jambs and head piece must be acurately plumbed and be completely square, or the door may not fit or operate correctly.
The frame is best fixed to brick or concrete structures by coach bolts or coach screws. With other types of prefabricated garage, the jambs and head frame should be screwed firmly to the frame.
Hanging of conventional swing garage doors is similar in method to that of hanging a conventional door, except that these heavier doors usually require more than one person to help in aligning the hinges. The “T”-pattern hinges, three on each side, ensure an even distribution of the weight. A trial hanging of each door should be carried out so that any necessary adjustments can be made.